Circulatory and Respiratory System

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Across
  1. 3. It happens when oxygen from the air enters the lungs.
  2. 4. The smallest blood cells.
  3. 7. The liquid component of the blood.
  4. 10. The other term for red blood cell which is the most abundant blood cell.
Down
  1. 1. It is a hollow muscular tubular structure also known as windpipe.
  2. 2. It is composed of the heart, blood, and blood vessels.
  3. 5. The main organs of the respiratory system.
  4. 6. It happens when the air is forced out of the lungs.
  5. 8. It separates the left and the right side of the heart.
  6. 9. It defends the body from microorganisms that can cause infection.